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@ 2013-06-07T10:05:46Z

<?php
var_dump(preg_match('/#user_id#/', 'http://c.cpa6.ru/3U9P/#user_id#'));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive preview

38.42 ms | 402 KiB | 5 Q